Evgeni Malkin brought the puck into the zone and lost control, but Bennett chased it down and raced in on the right side before flipping a shot over Nabokov's shoulder from in close to give the Penguins the lead 3:30 in.
Callahan made it 4-0 at 5:13 of the third with a power-play goal, flipping a shot over sprawled-out goalie Martin Brodeur, who tried to poke away the puck.